Black screen mio c320 3 months old, red light on, when press on button light goes green for 1 second then back to red, the screen stays black all the time. The screen went blank (white) while in use. Retried later screen staying black.???

This problem has happened to me before turn the gps unit over and clean off the gold colored conductors on the bottom take a paper clip and touch the 1st and 4th pins together this resets the unit be sure it is the 1st and 4th pins on the opposite side of the little power connector though.

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Download the user manual online and look for factory resettings. Follow instructions and it should work. On my Garmin, the same thing happened. On Garmin, you turn the unit off, press and hold the top left corner of your screen, and turn the unit on while pressing the top left corner of the screen. You wait for 10 seconds and a black dot appears and requests you touch it. The dot moves around the screen and you keep touching it. Once done, your screen perimeter is identified and all the letters fall in place when you press them. Good luck!

Turn the device off( from the back button) press volume up and the flag button( third from the right) in the same time and power on the device. Keep pressed the two buttons untill a screen shows . Press ok and then another ok. Then restart the device. This will do it